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David McKenzie
@dmckenzie001
World Bank researcher focusing on small businesses and migration & impact evaluation methods, Development Impact blogger, ...
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    Is your difference-in-differences reading list also getting really long? In today's post I summarize several papers that revisit the parallel trends assumption and what we learn from testing it holds in the pre-intervention periods
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    I'm about halfway through Banerjee and Duflo's Good Economics for Hard Times, and thought I'd reflect on the quite stark difference in the way they think about migration versus trade 1/21
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    What Are We Estimating When We Estimate Difference-in-Differences? Today on Development Impact @PJakiela summarizes @agoodmanbacon 's paper blogs.worldbank.org/impactevaluati…
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    Explaining why we should believe your DiD assumptions - economists have beefed up their statistical case for the validity of difference-in-differences, but still need to work on making an economic and rhetorical case. I take 3 recent QJE papers as examples
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    Motivated by a @MarshallBBurke question & @jhaushofer request, I've written up 7 ways you can improve power in an experiment without increasing the sample size n (number 4 may surprise you by saying you might want to reduce n) blogs.worldbank.org/impactevaluati… 1/3
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    Remembering Martin Ravallion: Berk Ozler and I celebrate the life and work of @MartinRavallion, who sadly died over the holiday break. He was an inspiration to both of us. blogs.worldbank.org/impactevaluati…
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    A crowd-sourced checklist of the top 10 little things that drive us crazy with regression output
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    Today in part 2 of my attempt to catch up on the new DiD literature: Revisiting the Difference-in-Differences Parallel Trends Assumption: Part II What happens if the parallel trends assumption is (might be) violated?
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    A new synthesis and key lessons from the recent difference-in-differences literature - I summarize the great new overview paper by @jondr44 @pedrohcgs @ambilinski & @DavidPoe223 and offer my takeaways plus what the literature still does not do well.
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    Replying to @BrunoGili1 @franciscome and @eduardoyeyati
    Honestly I have no clue which report they are referring to here, and was surprised to see my name there. I haven’t put anything out recently on this.
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    Why do so many small firms in developing countries selling the same product locate next to one another? The first in our job market series this year has @anni_vitali explaining agglomeration and the role of information frictions
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    Students, email your old profs every once in a while, they will love it. I had to write a couple of recommendation letters today, & happened to see ones I had written 15 years or so ago. I did a quick search and was delighted to see what these students were doing now 1/2
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    Development journals received more than 10,000 paper submissions in 2021. How many made it to referees? How long do different journals take in decisions? What are the acceptance rates? My annual overview of stats from different journals is now up
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    What’s the Latest Research in Development Economics? A Roundup from NEUDC 2022 - a classic @DaveEvansPhD & @Almedina1Music round-up of 135 conference papers